<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .top{
            width: 100%;
            height: 44px;
            text-align: center;
            position: fixed;
            top: 0;
            left: 0;
        }
        .box{
            padding-top: 44px;
            width: 1002px;
            margin: 0 auto;
        }
        .ad-l{
            position: fixed;
            left: 0;
            top:100px;
        }
        .ad-r{
            position: fixed;
            right: 0;
            top:100px;
        }

    </style>
</head>
<body>
    <div class="top">
        <img src="img/top.png" alt="">
    </div>
    <div class="box">    
        <img src="img/box.png" alt="">
        <img src="img/ad-l.png" alt="" class="ad-l">
        <img src="img/ad-r.png" alt="" class="ad-r">
    </div>
</body>
</html>